(19)
(11) EP 0 452 970 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.12.1991 Bulletin 1991/51

(43) Date of publication A2:
23.10.1991 Bulletin 1991/43

(21) Application number: 91106367.5

(22) Date of filing: 19.04.1991
(51) International Patent Classification (IPC)5: H01Q 1/32, H01Q 3/26, H01Q 3/02, G01C 21/20, G01S 3/42, G01S 3/46
(84) Designated Contracting States:
DE FR GB

(30) Priority: 19.04.1990 JP 103411/90

(71) Applicant: NEC CORPORATION
Tokyo (JP)

(72) Inventor:
  • Shimizu, Ryuji
    Minato-ku, Tokyo (JP)

(74) Representative: VOSSIUS & PARTNER 
Postfach 86 07 67
81634 München
81634 München (DE)


(56) References cited: : 
   
       


    (54) Antenna beam pointing method for satellite mobile communications system


    (57) A method for tracking a satellite in a land mobile satellite communications system is disclosed. A rate gyro is provided for use in the event that an automatic satellite tracking is prevented. The satellite is automatically tracked using a receive signal level if the receive signal level equals or exceeds a threshold. An output of the rate gyro is constantly compensated while automatically tracking the satellite. When the receive signal level falls below the threshold and the automatic satellite tracking becomes unable, the satellite is tracked using the compensated output of the rate gyro.






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